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Indiana's Great Lakes Water Quality Agreement (GLWQA) Domestic Action Plan (DAP) for the Western Lake Erie Basin (WLEB)

Welcome to Indiana's DAP

Indiana’s Great Lakes Water Quality Agreement (GLWQA) Domestic Action Plan (DAP) to reduce phosphorous to the Western Lake Erie Basin (WLEB) is the product of a dedicated Advisory Committee comprised of representatives from different stakeholder sectors and led by the Indiana Department of Environmental Management (IDEM). Founded on the principle of adaptive management, this DAP is a dynamic document acknowledging that phosphorous loading in particular, and nutrient pollution in general, is a very complex problem caused by point and nonpoint sources across all sectors, which requires a multi-dimensional solution.

The Advisory Committee was formed in April of 2016, met ten times in person, and held one conference call. Additionally, members who conduct surface water quality monitoring did site reconnaissance and held several meetings and conference calls to review water quality data analyses in order to prioritize watersheds and to refine the Advisory Committee’s hypotheses for the basis of adaptive management.

The draft DAP was put on public notice for a 60-day comment period, from August 14-October 13, 2017. Seven public meetings were held in the following locations:

Fort Wayne, August 23rd

1:00 PM session - 14 attendees (U.S. EPA attended)
5:30 PM session - 16 attendees

Auburn, August 24th (U.S.EPA attended)

10:30 AM session - 30 attendees
5:30 PM session - 12 attendees

Decatur, August 28th

8:00 AM session - 18 attendees
5:30 PM session - 9 attendees

Indianapolis, September 26th

6:00 PM session - 8 attendees

This revised DAP reflects input from public commenters as well as information refined since the draft DAP was released. This is a dynamic document and your continued input and support are welcome.

Background Information

The Great Lakes Nutrients Annex (Annex 4) is charged with coordinating actions to manage phosphorus loadings and concentrations within the Great Lakes. Indiana has been an active member of the Nutrients Annex since its establishment in 2013. Indiana’s commitment under the Nutrients Annex includes the development of a Domestic Action Plan (DAP) to assist in meeting nearshore and open water phosphorus objectives and loading targets for Lake Erie.

The focus of Indiana’s DAP is the 40% reduction goal for the Maumee River, which drives hazardous algal blooms (HABs) in the WLEB and contributes to central basin hypoxia.  The Maumee River is formed near Fort Wayne at the confluence of the St. Joseph River and the St. Mary’s River both of which enter Indiana from Ohio.  The Maumee River flows approximately 29 miles eastward into and through Ohio for another 108 miles to its mouth at Maumee Bay in Lake Erie near Toledo.

Indiana’s goal is to meet the spring-time flow weighted mean concentration (FWMC) targets of 0.23 mg/L and 0.05 mg/L for total phosphorus (TP) and dissolved reactive phosphorus (DRP) respectively in the Maumee River as it flows across the border into Ohio.  Indiana affirms that the reduction planned for the Maumee River will address Indiana’s obligation for the 40% phosphorus load reductions entering the WLEB, which in turn positively affects the Central Basin of Lake Erie.

Advisory Committee

Indiana’s GLWQA DAP for the WLEB Advisory Committee met monthly in 2016 and 2017 to coordinate the development of the DAP.  Beginning in 2018, the Advisory Committee will meet quarterly to discuss progress in meeting its goals. The following are Advisory Committee meeting agendas and summaries.


Marylou Renshaw, IDEM
(317) 308-3235

Jessica Faust, IDEM
(317) 308-3082


Indiana’s GLWQA DAP for the WLEB overview
Support/Efforts within Indiana’s portion of the WLEB

US Action Plan for Lake Erie
Lake Erie Action Plan Fact Sheet
Michigan Domestic Action Plan for Lake Erie
Michigan’s Implementation Plan
Ohio's Domestic Action Plan
State of Ohio’s Western Lake Erie Basin Collaborative Implementation Plan
Pennsylvania's Lake Erie Phosphorus Reduction Domestic Action Plan

Summary of Findings and Strategies to Move Toward a 40% Phosphorus Reduction
Nutrients Annex 2016 Progress Report of the Parties

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